GLENDALE, Ariz. — President Trump and prominent members of his Make America Great Again movement paid tribute Sunday to Charlie Kirk, praising the slain political conservative activist as a singular force whose work they must now advance.

The memorial service for Kirk, whom the president credits with playing a pivotal role in his 2024 election victory, drew tens of thousands of mourners, including Trump and Vice President JD Vance, other senior administration officials and young conservatives shaped by the 31-year-old firebrand.

Speakers highlighted Kirk’s profound faith and his strong belief that young conservatives need to get married, build families and pass on their values to keep building their movement. Those close to Kirk prayed and the floors shook from the bass of Christian rock bands as the home of the NFL’s Arizona Cardinals took on the feel of a megachurch service.

“Charlie looked at politics as an onramp to Jesus,” said the Rev. Rob McCoy, Kirk’s pastor.

Kirk’s killing at a Sept. 10 appearance on a Utah college campus has become a singular moment for the modern-day conservative movement. It also has set off a fierce national debate about violence and free speech in an era of deepening political division.

The shooting has stirred concern among some Americans who say that Trump is harnessing outrage over the killing as justification to suppress the voices of his critics and target political opponents.

High security and a full stadium

People began lining up before dawn to secure a spot inside State Farm Stadium west of Phoenix, where Kirk’s Turning Point organization is based. Security was tight, similar to the Super Bowl and similar high-profile events.

The 63,400-seat stadium quickly filled with people dressed in red, white and blue, as organizers suggested.

“I think that this is going to change things, and I think he made such a difference,” said Crystal Herman, who traveled from Branson, Mo. “He deserves us to be here.”

Photos of Kirk at work or with his wife, Erika, were on easels throughout the concession areas of the main concourse level. Some people posed for photos next to them.

“We’re going to celebrate the life of a great man today,” Trump told reporters before heading to Arizona. He said he was bracing for a “tough day.”

Trump has blamed the “radical left” for Kirk’s death and threatened to go after liberal organizations and donors or others he deems to be maligning Kirk or celebrating his death.

Many people, including journalists, teachers and late-show host Jimmy Kimmel have faced suspensions or lost their jobs as prominent conservative activists and administration officials target comments about Kirk that they deem offensive. The retaliation has in turn ignited a debate over the 1st Amendment as the Republican administration promises retribution against those who air remarks to which it objects.

Kirk was a provocateur who at times made statements seen by many as racist, misogynistic, anti-immigrant and transphobic. That has drawn backlash from some conservatives who cast the criticism as cherry-picking a few select moments to insult the legacy of someone they see as an inspirational leader.

A 22-year-old Utah man, Tyler Robinson, has been charged with killing Kirk and faces the death penalty if convicted of the most serious charges. Authorities have not revealed a clear motive in the shooting, but prosecutors say Robinson wrote in a text to his partner after the shooting that he “had enough” of what he considered to be Kirk’s hatred.

Kirk’s legacy

Turning Point, the group Kirk founded to mobilize young Christian conservatives, became a multimillion-dollar operation under his leadership with enormous reach.

“Charlie’s having some serious heavenly FOMO right now,” Turning Point Chief Executive Tyler Bower said, likening the moment to bringing “the Holy Spirit into a Trump rally.”

The crowd was a testament to the massive influence Kirk accumulated in conservative America with his ability to mobilize young people.

“I think he spoke on more than just politics,” Michael Link, 29, said outside the stadium. “Now that he’s gone, it’s like, who’s gonna speak for us now?”

His impact on modern-day conservatism went beyond U.S. shores.

Kirk “was very effective because he was convinced of his views and knew how to argue them,” Italian Prime Minister Giorgia Meloni said at a political rally Sunday in Rome. “But he never stopped smiling, never stopped respecting his interlocutor and anyone who challenged him.”

Kirk was a MAGA celebrity with a loyal following that turned out to support or argue with him as he traveled the country for the events like the one at Utah Valley University, where he was shot. Kirk expanded the organization, in large part through the force of his personality and debating chops.

Arizona is the adopted home state of Kirk, who grew up outside Chicago and founded Turning Point there before moving the organization to Phoenix. Vance has said Kirk’s advocacy was a big reason Trump picked him as his vice presidential running mate last year.

Scheduled speakers at the service included Trump, Vance, Health and Human Services Secretary Robert F. Kennedy Jr., Defense Secretary Pete Hegseth and Director of National Intelligence Tulsi Gabbard. Donald Trump Jr., right-wing commentator Tucker Carlson and White House aides Stephen Miller and Sergio Gor also were set to speak.

Also scheduled to speak was Kirk’s widow, who has been named Turning Point’s new leader and has pledged that “the movement my husband built will not die.”

Democratic Gov. Josh Shapiro of Pennsylvania, whose official residence was set ablaze by a suspected arsonist in April while the governor was celebrating Passover with his family and friends inside, said in a television interview broadcast Sunday that Americans must now come together to find “our better angels.”

“We’ve got to universally condemn political violence no matter where it is,” Shapiro said on NBC’s “Meet the Press.”

Cooper, Garcia and Madhani write for the Associated Press. Cooper and Garcia reported from Glendale, Madhani from Washington. AP writers Tiffany Stanley in Washington, Silvia Stellacci in Rome and Terry Tang contributed to this report.